Why doesn’t ev­ery app vi­brate?

Q When my iPhone 5 is set to silent mode, I still get vi­brate no­ti­fi­ca­tions for some apps, such as Face­book, but most of my other apps don’t alert me at all. I have checked that I have sounds en­abled in each app’s no­ti­fi­ca­tions set­tings but it doesn’t make any dif­fer­ence. Clara Dacey

A In­deed it doesn’t. You can only get vi­bra­tion no­ti­fi­ca­tions if the app is writ­ten to al­low them. This is a de­sign de­ci­sion for an app’s de­vel­op­ers, and the only way to get it changed is to pe­ti­tion them and ask for the fea­ture to be added in a fu­ture up­date. This might not work though be­cause I think that Ap­ple’s App Store cri­te­ria dis­cour­ages apps that un­nec­es­sar­ily bom­bard you with no­ti­fi­ca­tions, par­tic­u­larly when you have muted your phone.